IOCTL_SERIAL_SET_FIFO_CONTROL - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntddser.h

// CTL_CODE(0x001b, 0x027, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_SERIAL_SET_FIFO_CONTROL 0x001B009C
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Windows Driver Kit DDI reference (ni-ntddser-ioctl_serial_set_fifo_control)

IOCTL_SERIAL_SET_FIFO_CONTROL IOCTL

Description

The IOCTL_SERIAL_SET_FIFO_CONTROL request sets the FIFO control register (FCR). Serial does not verify the specified FIFO control information.

Parameters

Major code

Input buffer

The AssociatedIrp.SystemBuffer member points to a client-allocated ULONG that is used to input FIFO control information.

Input buffer length

The Parameters.DeviceIoControl.InputBufferLength is set to the size, in bytes, of a ULONG.

Output buffer

None.

Output buffer length

None.

Input/output buffer

Input/output buffer length

Status block

The Information member is set to zero.

The Status member is set to one of the Generic Status Values for Serial Device Control Requests.

View the official Windows Driver Kit DDI reference

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